Phthalic Anhydride with 0.02% Inhibitor
Phthalic anhydride stabilized with minimal hydroquinone inhibitor (0.02%) to prevent premature polymerization during storage/transport, allowable under Chapter 29 note (f). Specifically classified HTS 2917.35.00.00 as the primary product remains the pure anhydride.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If inhibitor concentration >0.5% or proprietary blend
Higher stabilizer levels create chemical preparation rather than pure compound with preservative
If inhibitor reacts forming phenol derivative
Chemical reaction products classified by principal function, not original anhydride
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Import Tips & Compliance
• Specify inhibitor type/concentration in commercial invoice and SDS to validate note (f) stabilizer exception
• Maintain stabilizer levels via sealed packaging - degradation changes product identity
• Avoid excess stabilizer declarations which trigger 3824 chemical mixture classification
Related Products under HTS 2917.35.00.00
Molten Phthalic Anhydride
Phthalic anhydride supplied in heated molten liquid form at 130-140°C to prevent solidification during bulk transport. Remains classified under HTS 2917.35.00.00 as the pure chemical compound per Chapter 29 note (a), with heat control considered normal transport practice.
Phthalic Anhydride Briquettes
Phthalic anhydride compressed into briquettes without binders for metallurgical and resin applications. Forming method qualifies as anti-dusting agent under Chapter 29 note (g), maintaining HTS 2917.35.00.00 classification.
Phthalic Anhydride Flakes
Phthalic anhydride in solid flake form, a white crystalline solid derived from o-xylene oxidation, used primarily in the production of plasticizers and resins. Classified under HTS 2917.35.00.00 as it is the pure aromatic polycarboxylic anhydride without impurities altering its chemical identity. Meets Chapter 29 note (a) for separate chemically defined organic compounds.
Phthalic Anhydride 99.5% Technical Grade
High-purity technical grade phthalic anhydride with 99.5% minimum assay, containing trace maleic anhydride impurities allowable under Chapter 29 note (a). Used in unsaturated polyester resin manufacturing and classified specifically under HTS 2917.35.00.00.
Phthalic Anhydride Pellets
Phthalic anhydride formed into uniform pellets for easier handling and dosing in resin production. The pelleting is solely for transport/preservation per Chapter 29 note (f), maintaining classification under HTS 2917.35.00.00 as the pure compound.
Food-Grade Phthalic Anhydride
Ultra-high purity phthalic anhydride (>99.9%) meeting food contact specifications for saccharin production. Classified HTS 2917.35.00.00 as chemically defined organic compound per Chapter 29 note (a), purity specification doesn't change tariff heading.